Abstract
This paper presents a combination of elemental and isotopic spatial distribution imaging with near-infrared hyperspectral imaging (NIR-HSI) to evaluate the diagenetic status of skeletal remains. The aim is to assess how areas with biogenic n(87Sr)/n(86Sr) isotope-amount ratios may be identified in bone material, an important recorder complementary to teeth. Elemental (C, P, Ca, Sr) and isotopic (n(87Sr)/n(86Sr)) imaging were accomplished via laser ablation (LA) coupled in a split stream to a quadrupole inductively coupled plasma mass spectrometer (ICP-QMS) and a multicollector inductively coupled plasma mass spectrometer (MC ICP-MS) (abbreviation for the combined method LASS ICP-QMS/MC ICP-MS). Biogenic areas on the bone cross section, which remained unaltered by diagenetic processes, were localized using chemical indicators (I(C)/I(Ca) and I(C) × 10/I(P) intensity ratios) and NIR-HSI at a wavelength of 1410 nm to identify preserved collagen. The n(87Sr)/n(86Sr) isotope signature analyzed in these areas was in agreement with the biogenic bulk signal revealed by solubility profiling used as an independent method for validation. Elevated C intensities in the outer rim of the bone, caused by either precipitated secondary minerals or adsorbed humic materials, could be identified as indication for diagenetic alteration. These areas also show a different n(87Sr)/n(86Sr) isotopic composition. Therefore, the combination of NIR-HSI and LASS ICP-QMS/MC ICP-MS allows for the determination of preserved biogenic n(87Sr)/n(86Sr) isotope-amount ratios, if the original biogenic material has not been entirely replaced by diagenetic material.
Original language | English |
---|---|
Pages (from-to) | 565–580 |
Number of pages | 16 |
Journal | Analytical and Bioanalytical Chemistry |
Volume | 411 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2018 |
Austrian Fields of Science 2012
- 107001 Archaeometry
Keywords
- Diagenesis
- FOSSIL BONE
- HIGH-THROUGHPUT DETERMINATION
- Human bone remains
- LASS ICP-QMS
- MC ICP-MS
- Near-infrared hyperspectral imaging
- PLASMA-MASS SPECTROMETRY
- PRESERVATION
- RATIO MEASUREMENTS
- SR/MATRIX SEPARATION METHOD
- STRONTIUM ISOTOPES
- TEETH
- TOOTH ENAMEL
- TRACE-ELEMENTS
- LASS ICP-QMS/MC ICP-MS